Blade mounting device

ABSTRACT

A blade mounting device for the mounting of blades, in particular, for skinning and stripping machines with a blade mount fixing ( 1 ), a blade support ( 3 ), a retaining strip ( 6 ) and a tensioning device ( 8 ) for holding the blade support and retaining strip together is disclosed. A swallow-tail shaped recess ( 17, 18 ) is provided across the total width of the facing surfaces of the blade support and retaining strip. A shaft ( 9 ), centrally mounted in the retaining strip ( 6 ) and eccentrically mounted in the blade mount fixing ( 1 ) serves as tensioning device.

STATE OF THE ART

[0001] The invention originates from a blade-mounting device accordingto the generic term of claim 1.

[0002] Such blade-mounting devices are used in particular for skinningand slab removal machines during meat, fish and poultry processing. Forthe removal of skin or slab the processing goods are pressed against ablade and moved in relation to the blade. The blade is clamped between ablade support on the one hand and a retaining strip on the other hand.The blade support is fastened to a blade mount suspension, which is usedin the machine, in particular a skinning and slab removal machine.

[0003] In order to hold the blade between the blade support and theretaining strip and to prevent shifting of the same, the blade supportand retaining strip are pressed together. For this purpose boltconnections are well-known from the state of the art. These have thedisadvantage that in order to remove the blade or for cleaning of thegaps between blade, blade support and retaining strip, the entireblade-mounting device needs to be removed from the machine, since thescrews are otherwise not accessible. In addition, the repeated openingand closing of the bolt connection leads to wear of the threads.Furthermore, the force exercised on the blade by the retaining strip isdifferent with different strong tightened screws along the entire lengthof the blade.

[0004] From DE 690 13 138 T2 a knife mounting device is well-known, inwhich the retaining strip with recesses engages in screw headsprojecting from the surface of the blade support. Blade support andretaining strip are pressed apart by a cam mechanism at the side facingaway from the blade. This leads to the fact that blade support andretaining strip are pressed together in the area of the blade. Thus theblade is localized. A bolt connection between blade support andretaining strip is thereby eliminated. It proves to be unfavorable withthis device that the force exercised by the retaining strip on the bladeis punctually larger in the area of the screws than in the remainingareas. In addition the disadvantage exists that for removing or cleaningthe blade and the gaps between blade, blade support and retaining stripthe entire retaining strip must be removed from the blade-mountingdevice and be put down in another place. It cannot remain at theretaining strip. During placing the retaining strip on the blade supportagain the recesses must be aligned with the screw heads. This areahowever can't be seen when placing the retaining strip. If the retainingstrip is not put on accurate, then the edges of the recess can bedamaged. This can lead to the fact that no sufficient forces can beapplied when clamping the retaining strip and the blade support forclamping the blade.

THE INVENTION AND ITS ADVANTAGES

[0005] In contrast to this the blade-mounting device according to theinvention with the characteristic features of claim 1 has the advantagethat the blade support and the retaining strip engage into one anotherover their entire width and are clamped against one another. For this adove tail-like shoulder is intended in each case in the blade supportand in the retaining strip. This dove tail-like shoulder runs parallelto the front edges of the blade support and the retaining strip, restingagainst the blade. The dovetailed shoulder is intended behind the areaof the blade support and the retaining strip, against which the bladerests. Therefore the shoulder does not affect the placing of the blade.The shoulder is formed by a step in the surfaces of the blade supportand the retaining strip facing each other. The step results from asurface, which is under a vertical angle against the two surface partsof the blade support and the retaining strip, forming the steps. Thedovetailed shoulders form thereby in each case a wedge.

[0006] A shaft serves as tensioning device, which is mounted with itsends eccentric at the blade mount suspension and is mounted centered inthe retaining strip. For tightening of the blade the dove tail-likeshoulders of the blade support and the retaining strip engage likewedges into one another and are clamped against each other throughrotation of the eccentrically mounted shaft. The surfaces of the bladesupport and the retaining strip slide one on the other while theshoulders engage into one another and are thereby guided accuratelywithout accessory. The rotation provides a movement of the blade supportand the retaining strip relative to each other, which take place exactlyperpendicular to the two shoulders. It is thereby not possible to jam ordamage the shoulders when putting the retaining strip on the bladesupport and when tightening it.

[0007] In addition the shaft serves the purpose to lift the retainingstrip off the blade support. The retaining strip does not need to beremoved completely from the blade-mounting device, but it is onlyswiveled against the blade support. The bearing for the shaft isintended at the side of the retaining strip facing away from the blade.Thus an accurate guidance of the retaining strip relative to the bladesupport is also ensured during lifting. Damage of the dovetailedshoulder of the blade or other parts of the blade-mounting device isthereby prevented. The blade-mounting device according to the inventionis thereby wear resistant. It ensures also during repeated opening andclosing of the tensioning device a uniform and strong pressing of theretaining strip against the blade support and thus against the blade.

[0008] After a favorable embodiment of the invention a lever is intendedas operating device at the shaft. This lever can be operated manually. Arotation of the lever of approx. 180° is sufficient for loosening andtightening the tensioning device. The lever is located in the area of anend of the shaft, so that it is easily accessible for the user. It isalso possible to intend two levers, whereby each of the two levers islocated at an end of the shaft. The two levers can also be connectedthrough a handle.

[0009] After a further favorable embodiment of the invention, the shaftis mounted axial adjustable in the blade mount suspension. The bearingexhibits at the retaining strip for the shaft a recess for hanging thelever. Thus several positions of the shaft and the lever are possible.In a first position the lever is hung into the recess of the bearing ofthe retaining strip. If the shaft is now rotated with the help of thelever, then the retaining strip can be lifted off the blade support orlowered on it. If the retaining strip rests on the blade support, thenthe shaft is shifted so far that the lever is no longer engaged in therecess of the bearing of the retaining strip. A following rotation ofthe shaft with the help of the lever leads to clamping the retainingstrip against the blade support.

[0010] After a further favorable embodiment of the invention either onestop for the blade is intended at the blade support, which extends overthe entire width of the blade support, or there are several stopsintended, which extend in each case only over a section of the bladesupport. Rails or disks serve for example as stops. For example severalround disks of the same diameter can be put collinear on the bladesupport. The stops facilitate the accurate positioning of the blade. Theblade is positioned preferably in such a way that its cutting edge runsparallel to the front edges of the retaining strip and the bladesupport. In order to be able to affect the depth of the cut, the stopsare variable. If several round disks are used as stops, then theposition of the blade relative to the blade mount can be changed byusing disks of different diameters. If rails are used as stop, then theattachment of the border to the blade mount can make a shifting of theborder possible.

[0011] Further benefits and favorable embodiments of the invention canbe taken from the following description, the drawing and the claims.

DRAWING

[0012] A design example of a blade-mounting device according to theinvention is represented in the drawing and following described in moredetail. Shown are:

[0013]FIG. 1 Blade-mounting device in a view from above,

[0014]FIG. 2 Cross-section through the blade-mounting device inaccordance with FIG. 1 in the place marked with I,

[0015]FIG. 3 Cross-section through the blade-mounting device inaccordance with FIG. 1, in the place marked with II,

[0016]FIG. 4 Cross-section through the blade-mounting device inaccordance with FIG. 1, in the place marked with III

[0017]FIG. 5 Section of FIG. 4, in the place marked with A,

[0018]FIG. 6 Blade support and retaining strip in magnified view.

DESCRIPTION OF THE DESIGN EXAMPLE

[0019] In FIGS. 1 to 4 a blade-mounting device is represented in a viewfrom above and in various cutting planes. A blade mount suspension 1exhibits lateral pegs 2, with which the blade-mounting device can behung up into a skinning and slab removal machine. A blade support 3 isfastened with screws 4 to the blade mount suspension 1, as can be seenin FIG. 2. The blade support cannot be seen in FIG. 1, since it islocated at the bottom part of the blade-mounting device. A blade 5 islaid on the blade support, which is clamped on the blade support bymeans of a retaining strip 6. Disks 7 are intended as stop for theblade, on which the blade with the side facing away from the cuttingedge is laid against. The disks are attached by means of a screw to thesurface of the blade support that is facing the retaining strip. Thedisks 7 are shown only dashed in FIG. 1, since they are not observableby the viewer in this view. They can however be seen in the sectionalview in accordance with FIG. 4.

[0020] A tensioning device 8 serves for the purpose of tightening theblade 5 between the blade support 3 and the retaining strip 6. Itconsists essentially of a shaft 9 and a lever 10. The shaft 9 is mountedeccentric in the side parts 13 and 14 of the blade mount suspension 1with the help of its bearing pegs 11. In the bearings 12 of theretaining strip however, the shaft is guided centered. The two bearingpegs 11 of the shaft 9 exhibit a smaller diameter than the remainingshaft. The section of large diameter of the shaft is shorter than thedistance of the two side parts 13 and 14 of the blade mount suspension.This permits a shifting of the shaft in axial direction. Recesses 15 areintended in the bearings 12 of the retaining strip. In a first position,which cannot be seen in FIG. 1, the shaft 9 is axially shifted so far tothe left that the lever 10 for the activation of the shaft engages inthe recess 15. If the shaft 9 is now rotated with the help of the lever,then the retaining strip 6 can be lifted off the blade support 3 andagain lowered on it. This position permits the replacement of the bladeand a cleaning of the gaps. In a second position the shaft 9 is axiallyshifted so far that the lever 10 is no longer engaged in the recess 15.This position is represented in FIG. 1. In this position of the shaftthe retaining strip 6 is lowered on the blade support. If the shaft 9 isnow rotated with the help of the lever 10, then the blade support 3 andthe retaining strip 6 are clamped against each other due to theeccentric mount of the shaft in the side parts 13 and 14 of the blademount suspension. The surfaces of the retaining strip 6 and the bladesupport 3 facing each ether slide on each other.

[0021] As can be seen in FIGS. 3 and 4, the blade support 3 and theretaining strip 6 exhibit in each case a dove tail-like shoulder 17 and18 at the surfaces facing each other. The dove tail-like shoulder isformed by a step in the two surfaces, at which the surface 19respectively 20 encloses with the surface portions 21 and 22respectively 23 and 24 in each case a vertical angle a. This creates awedge. This detail is represented for clarification in FIG. 6. The bladeis located in front of the two dovetailed shoulders 17 and 18. In theareas of the disks 7 serving as stop for the blade the dovetailedshoulders are interrupted. This can be seen in FIG. 4. Therepresentation in FIG. 5 shows that the blade 5 extends with its cuttingedge 25 beyond the blade support 3 and the retaining strip 6.

[0022] For the tightening of a blade 5 the retaining strip 6 is raisedwith the help of the lever 10 engaged into the recesses 15 and the blade5 is laid on the blade support 3 at the disks 7. Subsequently, theretaining strip 6 is lowered on the blade support 3 with the help of thelever 10 still engaged into the recesses 15. Then the shaft 9 is axiallyshifted, so that the lever 10 does not engage anymore in the recess 15.Subsequently, the shaft is rotated with the help of the lever whichleads due to the eccentric mount of the shaft 9 to the fact that theretaining strip 6 shifts in relation to the blade support 3. The shifttakes place perpendicular to the dovetailed shoulders 17 and 18. In thecase of this shift the surfaces of the blade support 3 and the retainingstrip 6 facing each other slide relatively to each other. Thereby thedovetailed shoulder 18 of the retaining strip engages in the dovetailedshoulder of the blade support like a wedge. This leads to the fact thatthe surfaces of the blade support 3 and the retaining strip 6 facingeach other turned are clamped against each other. The blade is clampedbetween the blade support 3 and the retaining strip 6 by the therebycreated force. The force is equal over the entire width of the bladesupport.

[0023] All features represented in the description, the following claimsand the drawing can be relevant for the invention both individually andin arbitrary combination with one another.

[0024] Reference Symbol List

[0025]1 Blade mount suspension

[0026]2 Peg

[0027]3 Blade support

[0028]4 Screw

[0029]5 Blade

[0030]6 Retaining strip

[0031]7 Disk

[0032]8 Tensioning device

[0033]9 Shaft

[0034]10 Lever

[0035]11 Peg

[0036]12 Bearing in the retaining strip

[0037]13 Side part of the blade mount suspension

[0038]14 Side part of the blade mount suspension

[0039]15 Recess

[0040]16

[0041]17 Dovetailed shoulder of the blade support

[0042]18 Dovetailed shoulder of the retaining strip

[0043]19 Surface of the shoulder of the blade support

[0044]20 Surface of the shoulder of the retaining strip

[0045]21 Area of the surface of the blade support

[0046]22 Area of the surface of the blade support

[0047]23 Area of the surface of the retaining strip

[0048]24 Area of the surface of the retaining strip

[0049]25 Cutting edge

1. Blade-mounting device for the mounting of oblong, flat blades with acutting edge, in particular with a blade mount suspension for theattachment of the blade-mounting device to a further device, inparticular to a slab removal and skinning machine, with a blade supportwhich is attached to the blade mount suspension, the blade rests along aportion of its surface against said blade support, with a retainingstrip for fastening the blade to the blade support, resting partiallyagainst the blade support and partially against the blade, and with atensioning device for clamping the blade support and the retaining striptogether, characterized by the fact, that the blade support exhibits atthe surface facing the retaining strip a first dove tail-like shoulderover its entire width, that the retaining strip exhibits at the surfacefacing the blade support a second dove tail-like shoulder over itsentire width, which engages in the first dove tail-like shoulder like awedge, that as tensioning device a shaft is intended, which is mountedeccentric at the blade mount suspension and is mounted centered in theretaining strip, whereby said shaft can be driven into rotation by anoperating device.
 2. Blade-mounting device according to claim 1,characterized by the fact that a lever is intended as operating deviceat the shaft.
 3. Blade-mounting device according to claim 2,characterized by the fact that the shaft is mounted axial adjustable inthe blade mount suspension, and that the bearing exhibits at theretaining strip for the shaft a recess for hanging the lever. 4.Blade-mounting device according to claim 1, characterized by the factthat a stop for the blade is intended at the blade support. 5.Blade-mounting device according to claim 2, characterized by the factthat a stop for the blade is intended at the blade support. 6.Blade-mounting device according to claim 3, characterized by the factthat a stop for the blade is intended at the blade support. 7.Blade-mounting device according to claim 6, characterized by the factthat the stop is variable.
 8. Blade-mounting device according to claim7, characterized by the fact that the stop is variable.